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A B777 flight crew experienced two sequential incidents of apparently fallacious wind shear alert warnings on takeoff roll for an international flight. The system was subsequently deferred but the flight; delayed enroute by weather; ultimately exceeded the flight crew's legal duty time.
| Attributes | |
| ACN | 1201484 |
| Time | |
| Date | 201408 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
During the takeoff roll approximately 100KIAS a windshear warning was received. The takeoff was rejected; reverse thrust was not used and we exited the runway without further incident. We were directed to a hard stand where our local maintenance crew boarded the aircraft and proceeded to complete the required tasks following a high speed abort. After brake cooling;refueling and filing a new flight plan we taxied to runway 29 for takeoff. Winds were reported 240 @ 6K. At approximately 65KIAS another windshear warning was annunciated and the takeoff was discontinued. After consulting with maintenance the decision was made to [defer the windshear warning system]. At the time we were all in agreement the system was unreliable. We returned to runway 29; took off and completed the flight with no further incident. A maintenance supervisor met the flight and I debriefed him in detail. I conveyed to him that the crew had no way of validating the windshear warning system. Since all other airplanes were taking off and landing normally that night; in our best judgement it was safe to takeoff and complete the flight.
Original NASA ASRS Text
Title: A B777 flight crew experienced two sequential incidents of apparently fallacious wind shear alert warnings on takeoff roll for an international flight. The system was subsequently deferred but the flight; delayed enroute by weather; ultimately exceeded the flight crew's legal duty time.
Narrative: During the takeoff roll approximately 100KIAS a windshear warning was received. The takeoff was rejected; reverse thrust was not used and we exited the runway without further incident. We were directed to a hard stand where our local maintenance crew boarded the aircraft and proceeded to complete the required tasks following a high speed abort. After brake cooling;refueling and filing a new flight plan we taxied to runway 29 for takeoff. Winds were reported 240 @ 6K. at approximately 65KIAS another windshear warning was annunciated and the takeoff was discontinued. After consulting with maintenance the decision was made to [defer the windshear warning system]. At the time we were all in agreement the system was unreliable. We returned to runway 29; took off and completed the flight with no further incident. A maintenance supervisor met the flight and I debriefed him in detail. I conveyed to him that the crew had no way of validating the windshear warning system. Since all other airplanes were taking off and landing normally that night; in our best judgement it was safe to takeoff and complete the flight.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.